[* EiR = Econometrics in Replications, a feature of TRN that highlights useful econometrics procedures for re-analysing existing research. The material for this blog is drawn from the recent working paper “ Two-way fixed effects estimators with heterogeneous treatment effects” by Clément de Chaisemartin and Xavier D’Haultfoeuille, posted at ArXiv.org] NOTE #1: All the data and code (Stata) necessary to produce the results in the tables below are available at Harvard’s Dataverse: click here.